Application Specifications for Test Specimens for Hardness Measuring Device:

• Type of impact device (Impact Device):

  • DC: Inner wall of small space.
  • C: Small or thin specimen, coating.
  • D: General use.
  • D+15: Deep groove.
  • DL: Narrow slit or small hole.
  • G: Casting or forging specimen.

• Maximum surface roughness of specimen (Ra):

  • DC, D, DL, D+15: 1.6μm.
  • C: 0.4μm.
  • G: 7μm.

• Minimum weight of workpiece:

  • Direct measurement:
    • DC, D, D+15, DL: 5kg.
    • C: 1.5kg.
    • G: 15kg.
  • Coupled on plate:
    • DC, D, D+15, DL: 2kg.
    • C: 0.5kg.
    • G: 0.5kg.

• Minimum thickness of workpiece:

  • DC, D, D+15, DL: 5mm.
  • C: 1mm.
  • G: 10mm.